1) I tried that RPM Minenraumer too - a singularly terrible experience. I've never encountered a plastic that genuinely weird and awful to work with. I ended up in the garbage in short order.
2) I don't celebrate a company going out of business but Kitty Hawk should have been ashamed of that first generation of kits they put out. I have no idea what their design philosophy was but "let's not bother to ensure that anything in the kit fits together" wasn't much of a business model to build a new company around. I tried their 1/48 MIG-25 PD/PDS Foxbat and it was a miserable experience from the beginning to then end when it ended up in the trash. Absolutely nothing fit right in the slightest. I'm not a rivet counter so inaccurate details don't bother me too much. But someone producing a kit where almost all the fits were terrible bothers me a great deal. I'd like to think that Kitty Hawk could have gotten better but the contempt they obviously had for the buyers of that first generation of their kits indicated that going out of business was the only way they'd learn. Not much sense IMO in putting out new kits of subjects that have been ignored too much if the models turn out to be near-unbuildable even for experienced modelers.
3) Most of the old AMT Star Trek kits can really get under my skin. They've pushed a lot of those ancient molds for far too many years and really need to retire them. I tried the reboxing of the USS Enterprise NCC-1701 refit recently and had trouble with it all the way through. Large distortions along the lenght nacelle seams that even a ton of putty couldn't fix. The attachment points for the engine struts to sit in the engineering section were wildly off-level. The viewing port inserts along the rim of the saucer section all sunk inwards too much and needed lots of work to bring them level to the rim surface. AMT couldn't even bother to mention that weights need to be added to the rear near the shuttlecraft bay to prevent the model from leaning forward due to the saucer section wildly out-weighing the aft portion of the ship. All it all it was unpleasant. I didn't bother finishing it and am using it instead as a test bed for airbrush practice. I wish someone else would get in the game and produce some brand-new Star Trek models. AMT's been complacent for far too long and they need someone to come along to give them a good kick in the pants to make them stop it with the ancient, inaccurate, and burnt-out molds they keep using to churn some of their kits out.